First record of Stylostomum ellipse (Dalyell, 1853) (Platyhelminthes, Polycladida) from the Pacific Ocean

The polyclad flatworm Stylostomum ellipse (Dalyell, 1853) has hitherto been recorded from the Antarctic region, Mediterranean Sea, Patagonian region, Scandinavia, South Africa, and South Georgia Island. In this study, we report S. ellipse for the first time from the Pacific Ocean based on specimens...

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Bibliographic Details
Published in:Check List
Main Authors: Aoi Tsuyuki, Yuki Oya, Hiroshi Kajihara
Format: Article in Journal/Newspaper
Language:English
Published: Pensoft Publishers 2020
Subjects:
Cosmopolitan species
Euryleptidae
genetic distan
Biology (General)
QH301-705.5
Antarctic
The Antarctic
Pacific
South Georgia Island
Antarc*
Online Access:https://doi.org/10.15560/16.3.773
https://doaj.org/article/29e76e5747de48579f2122ee285030e9
Description
Summary:The polyclad flatworm Stylostomum ellipse (Dalyell, 1853) has hitherto been recorded from the Antarctic region, Mediterranean Sea, Patagonian region, Scandinavia, South Africa, and South Georgia Island. In this study, we report S. ellipse for the first time from the Pacific Ocean based on specimens collected in Hokkaido, northern Japan. Our specimens are morphologically identifiable as S. ellipse, but may represent a biologically different species from a population of the Mediterranean Sea. This is because, based on the previous genetic data of other cotylean species, the observed uncorrected p-distance 0.02160 between the two distinct populations in terms of a partial 972 bp region of the 28S rDNA sequence may be great enough to separate the species biologically.

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